BIO153H5 Chapter 33: Chapter 33
Document Summary
Concept 33. 1: sponges are basal animals that lack true tissues. Sponges are suspension feeders: they capture food particles suspended in the water that passes through their body, which in some species resembles a sac perforated with pores. Scyphozoans the medusa is the prominent stage in the life cycle; the medusa of most species live among the plankton as jellies. Most coastal scyphozoans go through a stage as small polyps during their life cycle, whereas those that live in the open ocean generally lack the polyp stage altogether. Concept 33. 3: lophotrochozoans have the widest range of animal body forms. Molecular evidence suggests that there are three major clades of bilaterally symmetrical animals: lophotrochozoa, Lophotrochozoan comes from features found in some of its members; some develop a lophophore (a crown of ciliated tentacles that function in feeding), while others go through a distinctive stage called the trochophore larva.
